[SI-LIST] Four layer PCB interplane signal voltage

From: Doug Smith <doug@xxxxxxxxxx>
To: emc-pstc <emc-pstc@xxxxxxxx>, Si-List <si-list@xxxxxxxxxxxxx>
Date: Fri, 04 Jun 2010 22:35:13 -0700

Hi Everyone,

I just finished up my technical article for June. It includes some very 
interesting data on four layer boards.

Technical Tidbit - June 2010
Routing Signals Between PCB Layers -  Part Three, Interplane Voltage
(Frequency Domain Measurement)

Abstract: Four layer PCBs are used in a wide variety of applications. 
However, usually it is necessary for some signal paths to be routed on 
both the top and bottom signal layers to achieve required routing 
density. Using a model of a four layer PCB with ground and power planes, 
data is presented that shows routing a signal on both signal layers can 
cause significant signal voltage to be developed between the planes 
unless a simple design rule is observed.

The article is at: http://emcesd.com/tt2010/tt060310.htm

Next week I hope to put up a 15 minute video of the experiment on 
CircuitAdvisor.com although I have a lot of travel over the next two 
weeks so it might be delayed a bit.

Doug

-- 
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     ___          _       Doug Smith
      \          / )      P.O. Box 1457
       =========          Los Gatos, CA 95031-1457
    _ / \     / \ _       TEL/FAX: 408-356-4186/358-3799
  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
  \ _ /    ]    \ _ /     Website: http://www.dsmith.org
-------------------------------------------------------

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[SI-LIST] Four layer PCB interplane signal voltage

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